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GitHub - cachebag/jumpy: Sweet-spot between trad programm...
cachebag · 2026-05-18 · via Hacker News - Newest: "AI"

Inspired by 99: I, like Prime, wanted a tool to allow for me to still be in the driver seat if I am going to spawn an AI to edit my code.


image image

The main difference between jumpy and other tools, like 99, are:

feature jumpy avante / sidekick codecompanion inline claude code / aider
Interaction model Inline prompt → hunks in buffer Sidebar chat → apply Inline edit → accept/reject CLI agent → full file writes
Review granularity Per-hunk accept/reject Per-file or per-suggestion Per-change Post-hoc (git diff)
Context switch None: you stay in buffer Sidebar opens Minimal Leave editor or split terminal
LLM output format Search/replace blocks Full file / patch Full file Full file via temp
Token efficiency High (only changed lines sent back) Lower (full context) Lower Lower
Scope Single targeted edit Multi-file refactors, chat Single edit or chat Whole-project agentic tasks

Some of these are to be fleshed out, but the sole purpose is to know exactly what I am letting the LLM write into my code. I have no interest in letting it change everything, and only then can I go back and review every change.

So the philosophy here is: yes, I still want to handwrite my code AND use AI, but I prefer that I have full control over what the AI is writing. I don't want to have to wait until it finishes in order to review its changes.

That being said, I don't know wtf I'm doing, and right now, this really doesn't work very well.

But hopefully it will soon :P

Install

-- lazy.nvim
{
  "cachebag/jumpy",
  config = function()
    require("jumpy").setup({
      provider = "anthropic", -- or "openai", "openrouter"
    })
  end,
}

set your API key: export ANTHROPIC_API_KEY="sk-ant-..." (or OPENAI_API_KEY, JUMPY_API_KEY for openrouter).

Use

Keybind Action
<leader>j Open prompt, type your change, hit <CR>
]h / [h Next / previous hunk
<leader>a Accept hunk
<leader>x Reject hunk
<leader>A Accept all hunks
<leader>X Reject all hunks
<leader>r Reprompt the hunk under cursor

License

MIT